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 ValidateEmail(){
	var emailID=document.form.email
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }


  
 function validate_submit()
  {
     with (document.form)
    {
    
        if (name.value =="")
        {
            alert("Please fill in your name!!");
            name.focus();
             return false
         }
         
        else if (contact.value =="")
        {
            alert("Please fill in your contact no!!");
            contact.focus();
            return false
         }
         
        else if (email.value =="")
        {
            alert("Please fill in your email!!");
            email.focus();
             return false
         }
        else if (product.value =="")
        {
            alert("Please fill the product!!");
            product.focus();
             return false
         }
      
        else if (quantity.value =="")
        {
            alert("Please fill in the quntity!!");
            quantity.focus();
             return false
         }
      
       
        else{
            return true
        }

      }
    
  }