function validateForm(form) {

if (form.custName.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your name</b></font>"; 
   form.custName.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (form.custEmail.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your email address</b></font>"; 
   form.custEmail.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (echeck(form.custEmail.value)==false){
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter a valid email address</b></font>"; 
   form.custEmail.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (form.custText.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your request!</b></font>"; 
   form.custText.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
}

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					
}