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("Please enter a valid email address.")
			   return false
			}

			if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
			   alert("Please enter a valid email address.")
			   return false
			}

			if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
				alert("Please enter a valid email address.")
				return false
			}

			 if (str.indexOf(at,(lat+1))!=-1){
				alert("Please enter a valid email address.")
				return false
			 }

			 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
				alert("Please enter a valid email address.")
				return false
			 }

			 if (str.indexOf(dot,(lat+2))==-1){
				alert("Please enter a valid email address.")
				return false
			 }
			
			 if (str.indexOf(" ")!=-1){
				alert("Please enter a valid email address.")
				return false
			 }

			 return true					
		}

	function ValidateForm(){
		var emailID=document.emailForm.txtEmail
		
		if ((emailID.value==null)||(emailID.value=="")){
			alert("Please Enter your email address.")
			emailID.focus()
			return false
		}
		if (echeck(emailID.value)==false){
			emailID.value=""
			emailID.focus()
			return false
		}
		return true
	 }