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 email")
		   return false
		}

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

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

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

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

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

 		 return true					
	}

 		
// this function checks the entire form		
	function ValidateForm(){
		var emailID=document.contact_form.email
		var fullName=document.contact_form.fullname
		
		if ((fullName.value==null)||(fullName.value=="")){
							alert("Please enter your full name")
							fullName.focus()
							return false
		}
		if ((emailID.value==null)||(emailID.value=="")){
			alert("Please enter your email")
			emailID.focus()
			return false
		}
		if (echeck(emailID.value)==false){
			emailID.value=""
			emailID.focus()
			return false
		}
		return true
	 }
	 
	 
// this function checks the entire form		
	function ValidateForm2(){
		var emailID=document.feedback_form.email
		var fullName=document.feedback_form.fullname
		
		if ((fullName.value==null)||(fullName.value=="")){
							alert("Please enter your full name")
							fullName.focus()
							return false
		}
		if ((emailID.value==null)||(emailID.value=="")){
			alert("Please enter your email")
			emailID.focus()
			return false
		}
		if (echeck(emailID.value)==false){
			emailID.value=""
			emailID.focus()
			return false
		}
		return true
	 }