www.wysiwygwebbuilder.com

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onKeyDown="textCounter(this,'progressbar1',500)" 
onKeyUp="textCounter(this,'progressbar1',500)" 
onFocus="textCounter(this,'progressbar1',500)"></textarea><br />

<div id="progressbar1" class="progress" style="position:absolute;left:15px;top:530px"></div>

<script>textCounter(document.getElementById("TextArea1"),"progressbar1",500)</script

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<style type="text/css">

.progress{
	width: 1px;
	height: 14px;
	color: white;
	font-size: 12px;
  overflow: hidden;
	background-color: #FF0000;
	padding-left: 5px;
       
}

</style>

<script type="text/JavaScript">

function textCounter(field,counter,maxlimit,linecounter) {
	// text width//
	var fieldWidth =  parseInt(field.offsetWidth);
	var charcnt = field.value.length;        

	// trim the extra text
	if (charcnt > maxlimit) { 
		field.value = field.value.substring(0, maxlimit);
	}

	else { 
	// progress bar percentage
	var percentage = parseInt(100 - (( maxlimit - charcnt) * 100)/maxlimit) ;
	document.getElementById(counter).style.width =  parseInt((fieldWidth*percentage)/101)+"px";
	document.getElementById(counter).innerHTML=" "+percentage+"%"
	// color correction on style from CCFFF -> CC0000
	setcolor(document.getElementById(counter),percentage,"background-color");
	}
}

function setcolor(obj,percentage,prop){
	obj.style[prop] = "rgb(80%,"+(100-percentage)+"%,"+(100-percentage)+"%)";
}

</script>