function detect_page() {
	x = document.getElementById("detect_page").value;
	document.getElementById(x).className = "hover";
	document.getElementById(x).href = "";
}
function show_prev(e) {
	document.getElementById('imgcontainer').src = e;
}
function isNumberKey(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57)) {
    	return false;
	} else {
		return true;
	}
}
function enadis(x,y) {
	if(x.checked==true) {
		document.getElementById(y).disabled = false;
		document.getElementById(y).value = "1";
		document.getElementById(y).focus();
	} else {
		document.getElementById(y).disabled = true;
		document.getElementById(y).value = "";
	}
}
function putitems(x,y,z,a,b) {
	if (z.checked==true) {
		document.getElementById(x).value = y;
		document.getElementById(a).value = b;
	} else {
		document.getElementById(x).value = "";
		document.getElementById(a).value = "";
	}
}
function checkForm(){
	var form = window.document.myForm;
	var errors = 'Please Enter the Following:\n\n';

	//regular expression for checking email
	var re = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	var alpha = new RegExp("[a-zA-Z]");
	var digit = new RegExp("[0-9]");
	var truecount=0;
	
	if(form.compname.value == ''){
		errors += "Company name \n";
	}
	if(form.contactperson.value == ''){
		errors += "Contact Person \n";
	}
	if(form.compadd.value == ''){
		errors += "Company Address \n";
	}
	if(form.deladd.value == ''){
		errors += "Delivery Address \n";
	}
	if(form.telno.value == ''){
		errors += "Telephone Number \n";
	}
	if(form.faxno.value == ''){
		errors += "Fax Number \n";
	}
	mail = form.email.value;
	if(!re.test(mail)){
		errors += "Valid Email Address\n";
	} else {
		truecount++;
	}
	
	//return false;
	if(errors != 'Please Enter the Following:\n\n'){
		alert(errors);
		return false;
	}else{
		return true;
	}
}
<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->

function is_loaded() { //DOM
	if (document.getElementById){
		document.getElementById('preloader').style.visibility='hidden';
		document.getElementById('MainContent').style.display='block';
	} else {
		if (document.layers) { //NS4
			document.preloader.visibility = 'hidden';
			document.MainContent.display = 'block';
		}
		else { //IE4
			document.all.preloader.style.visibility = 'hidden';
			document.all.MainContent.style.display = 'block';
		}
	}
}