JavaScript - Editor de texto en javascript

Hola, consegui un codigo de la web para poder realizar un editor de texto en un textbox de php. Lo que quiero hacer es que el usuario pueda darle forma a sus texto y luego enviarlo a la base de datos.
Estuve tocando un poco el código y funciona bien con la base de datos. Sólo que cuando el usuario escribe directamente sin elegir ninguna opcion (o sea negrita, subrayado, etc) me deja dos lineas entre cada renglón o sea 2 </br> del php. No conozco mucho del código java y necesitaría ver si me ayudan a solucionar este pequeño inconveniente. Aquí les paso el codigo:

if (o(idTa).nodeName=="TEXTAREA"){
o(idTa).style.color='#060';
o(idTa).style.zIndex='2';
} else w('<input type="hidden" id="wzhid_'+idTa+'" name="'+idTa+'" />');
h(idTa);
var frm=o(idTa).parentNode;
while (frm.nodeName != 'FORM') frm=frm.parentNode;//if not form, keep trying
addEvt(frm,"submit",syncTextarea);
w('<style type="text/css">button {vertical-align:middle;padding:0;margin:1px 0} button img{vertical-align:middle;margin:-1px} select{vertical-align:middle;margin:1px} .wzCtrl {background:ButtonFace; border:2px outset ButtonShadow; padding:5px;} #sourceTa{color:#060;font-family:mono;} #whizzyWig {border-width:1px}</style>');
var dsels='formatblock';
if (!navigator.userAgent.match('AppleWebKit')){dsels+=' fontname fontsize'} //Font u/s on Chrome/Safari
var dbuts=' bold italic underline | left center right justify | number bullet indent outdent | undo redo | color hilite rule | link image table | clean html spellcheck ';
btns=dbuts.split(' ');
for (var i=0, pos=0; i < btns.length; i++) {
if(btns[i] && btns[i]!='|') {btn[btns[i]]=btn._w*pos++};
}
var tbuts=' tstart add_row_above add_row_below delete_row | add_column_before add_column_after delete_column | table_in_cell';
var t_end=''; //table controls end, if needed
controls=controls ? controls.toLowerCase() : "all";
if (controls == "all") controls=dsels +' newline '+ buts + dbuts + tbuts;
else controls += tbuts;
w('<div style="width:'+taWidth+'" onmouseover="c(\''+idTa+'\')"><div id="CONTROLS'+idTa+'" class="wzCtrl" unselectable="on">');
gizmos=controls.split(' ');
for (var i=0; i < gizmos.length; i++) {
if (gizmos[i]){ //make buttons and selects for toolbar, in order requested
if (gizmos[i] == 'tstart') {
w('<div id="TABLE_CONTROLS'+idTa+'" style="display:none" unselectable="on">');
t_end='</div>';
}
else if (gizmos[i] == '|') w(' <big style="padding-bottom:2em">|</big> ');
else if (gizmos[i] == 'newline') w('<br>');
else if ((dsels+sels).indexOf(gizmos[i]) != -1) makeSelect(gizmos[i])
else if ((dbuts+buts+tbuts).indexOf(gizmos[i]) != -1) makeButton(gizmos[i]);
}
}
w(t_end) //table controls end
w('<a href="http://www.unverse.net" style="color:buttonface" title="'+whizzywig_version+'">.</a> ');
w(fGo('LINK'));
if (linkBrowse) w('<input type="button" onclick=doWin("'+linkBrowse+'"); value="'+t("Browse")+'"> ');
w(t('Link address (URL)')+': <input type="text" id="lf_url'+idTa+'" size="60"><br><input type="button" value="http://" onclick="o(\'lf_url'+idTa+'\').value=\'http://\'+o(\'lf_url'+idTa+'\').value"> <input type="button" value="mailto:" onclick="o(\'lf_url'+idTa+'\').value=\'mailto:\'+o(\'lf_url'+idTa+'\').value"><input type="checkbox" id="lf_new'+idTa+'">'+t("Open link in new window")+fNo(t("OK"),"insertLink()"));//LINK_FORM end
w(fGo('IMAGE'));
if (imageBrowse) w('<input type="button" onclick=doWin("'+imageBrowse+'"); value="'+t("Browse")+'"> ');
w(t('Image address (URL)')+': <input type="text" id="if_url'+idTa+'" size="50"> <label title='+t("to display if image unavailable")+'><br>'+t("Alternate text")+':<input id="if_alt'+idTa+'" type="text" size="50"></label><br>'+t("Align")+':<select id="if_side'+idTa+'"><option value="none">_♥_ '+t("normal")+'</option><option value="left">♥=  '+t("left")+'</option><option value="right">=♥  '+t("right")+'</option></select> '+t("Border")+':<input type="text" id="if_border'+idTa+'" size="20" value="0" title="'+t("number or CSS e.g. 3px maroon outset")+'"> '+t("Margin")+':<input type="text" id="if_margin'+idTa+'" size="20" value="0" title="'+t("number or CSS e.g. 5px 1em")+'">'+fNo(t("Insert Image"),"insertImage()"));//IMAGE_FORM end
w(fGo('TABLE')+t("Rows")+':<input type="text" id="tf_rows'+idTa+'" size="2" value="3"> <select id="tf_head'+idTa+'"><option value="0">'+t("No header row")+'</option><option value="1">'+t("Include header row")+'</option></select> '+t("Columns")+':<input type="text" id="tf_cols'+idTa+'" size="2" value="3"> '+t("Border width")+':<input type="text" id="tf_border'+idTa+'" size="2" value="1"> '+fNo(t("Insert Table"),"makeTable()"));//TABLE_FORM end

function tagButs() {
w('<input type="button" onclick=\'doTag("<h1>")\' value="H1" title="<H1>"><input type="button" onclick=\'doTag("<h2>")\' value="H2" title="<H2>"><input type="button" onclick=\'doTag("<h3>")\' value="H3" title="<H3>"><input type="button" onclick=\'doTag("<h4>")\' value="H4" title="<H4>"><input type="button" onclick=\'doTag("<p>")\' value="P" title="<P>"><input type="button" onclick=\'doTag("<strong>")\' value="S" title="<STRONG>" style="font-weight:bold"><input type="button" onclick=\'doTag("<em>")\' value="E" title="<EM>" style="font-style:italic;"><input type="button" onclick=\'doTag("<li>")\' value="•—" title="<LI>"><input type="button" onclick=\'doTag("<a>")\' value="@" title="<A HREF= >"><input type="button" onclick=\'doTag("<img>")\' value="[♥]" title="<IMG SRC= >"><input type="button" onclick=\'doTag("<br />")\' value="←" title="<BR />">');
}
ih=d.body.innerHTML;
ih=ih.replace(/(<\/?)FONT([^>]*)/gi,"$1span$2")
.replace(/(<\/?)[Bb](\s+[^>]*)?>/g, "$1strong$2>")
.replace(/(<\/?)[Ii](\s+[^>]*)?>/g, "$1em$2>")
.replace(/<\/?(COL|XML|ST1|SHAPE|V:|O:|F:|F |PATH|LOCK|IMAGEDATA|STROKE|FORMULAS)[^>]*>/gi, "")
.replace(/\bCLASS="?(MSOw*|Apple-style-span)"?/gi,"")
.replace(/<[^>]+=[^>]+>/g,qa) //quote all atts
.replace(/[–]/g,'-') //long –
.replace(/[‘’]/g, "'") //single smartquotes ‘’
.replace(/[“”]/g, '"') //double smartquotes “”
.replace(/<(TABLE|TD|TH|COL)(.*)(WIDTH|HEIGHT)=["'0-9A-Z]*/gi, "<$1$2") //no fixed size tables (%OK) [^A-Za-z>]
.replace(/<([^>]+)>\s*<\/\1>/gi, "") //empty tag
.replace(/>(<\/?[C-Z])/gi,">\n$1") //newline adjacent tags
.replace(/(<BR ?\/?>)([^\r\n])/gi,"$1\n$2") //newline on BR
.replace(/([^\n])<(P|DIV|TABLE|FORM)/gi,"$1\n\n<$2") //add white space
.replace(/\n<(LI|OPTION|TR|INPUT)/gi,"\n <$1") //indent..
.replace(/\n<(TD|TH)/gi,"\n <$1") //..more
.replace(location.href+'#','#') //IE anchor bug
.replace(/<(IMG|INPUT|BR|HR|LINK|META)([^>]*)>/gi,"<$1$2 />") //self-close tags
.replace(/(<\/?[A-Z]*)/g,lc) //lowercase tags...
.replace(/style="[^"]*"/gi,sa) //and style atts
return ih;
}

if (cmd) {
makeSo(cmd, prm);
e.preventDefault(); // stop the event bubble
e.stopPropagation();
}
}
function doTag(html) { // insert HTML into text area
var url;
if (!html) html=prompt("Enter some HTML or text to insert:", "");
o(idTa).focus();
if (html == '<a>') {
url=prompt("Link address:","http://");
html='<a href="'+url+'">';
}
if (html == '<img>') {
url=prompt("Address of image:","http://");
var alt=prompt("Description of image");
html ='<img src="'+url+'" alt="'+alt+'">';
}
var close='';
if (html.indexOf('<') == 0 && html.indexOf('br') != 1 && html.indexOf('img') != 1)
close=html.replace(/<([a-z0-6]+).*/,"<\/$1>");
if (html != '<strong>' && html != '<em>') close += '\n';
if (document.selection) {
sel=document.selection.createRange();
sel.text=html+sel.text+close;
} else {
before=o(idTa).value.slice(0,o(idTa).selectionStart);
sel=o(idTa).value.slice(o(idTa).selectionStart,o(idTa).selectionEnd);
after=o(idTa).value.slice(o(idTa).selectionEnd);
o(idTa).value =before+html+sel+close+after;
}
o(idTa).focus();
}
function insHTML(html) { //insert HTML at current selection
if (!html) html=prompt(t("Enter some HTML or text to insert:"), "");
if (html.indexOf('js:') == 0) {
try{eval(html.replace(/^js:/,''))} catch(e){}; return;
}
try {if (sel.type && sel.type!="Text") sel=""; xC("inserthtml",html+sel);}
catch (e) {if (document.selection) {
if (papa && papa.nodeName == 'IMG') {papa.outerHTML=html;}
else if(rng) {rng.select(); rng.pasteHTML(html+rng.htmlText);}
} }
whereAmI();
}