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This JavaScript converts special HTML characters to their entities version inside user entered data such as a TEXTAREA before the form is submitted.

Label: HTML to Entities script

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<SCRIPT type=text/javascript>

// HTML to Entities (form) script- By JavaScriptKit.com (http://www.javascriptkit.com)
// For this and over 400+ free scripts, visit JavaScript Kit- http://www.javascriptkit.com/
// This notice must stay intact for use

function html2entities(){
var re=/[(<>"'&]/g
for (i=0; i<arguments.length; i++)
arguments[i].value=arguments[i].value.replace(re, function(m){return replacechar(m)})
}

function replacechar(match){
if (match=="<")
return "&lt;"
else if (match==">")
return "&gt;"
else if (match=="\"")
return "&quot;"
else if (match=="'")
return "&#039;"
else if (match=="&")
return "&amp;"
}


</SCRIPT>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<FORM><TEXTAREA style="WIDTH: 400px; HEIGHT: 100px" name=data1></TEXTAREA><BR>
<INPUT onclick=html2entities(this.form.data1) type=button value="Convert special chars to entities"> 
</FORM>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->