function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}


function contactfrmvalidation(){
	if(document.contact_us.first_name.value==''){
		alert("Please enter Your First Name");
		document.contact_us.first_name.focus();
		return false;
	}
	if(document.contact_us.last_name.value==''){
	alert("Please enter Your Last Name");
	document.contact_us.last_name.focus();
	return false;
	}
	if(document.contact_us.tel_no.value==''){
		alert("Please enter Your Telephone");
		document.contact_us.tel_no.focus();
		return false;
	}
	if(document.contact_us.email.value==''){
		alert("Please enter Your Email Id");
		document.contact_us.email.focus();
		return false;
	}
	if (echeck(document.contact_us.email.value)==false){
		document.contact_us.email.value=""
		document.contact_us.email.focus()
		return false
	}
	if(document.contact_us.message.value==''){
		alert("Please enter Your Request Description");
		document.contact_us.message.focus();
		return false;
	}
}