function validate_custom(form1)
{

	if (form1.name.value == "")
		{
			alert("Please enter your name")
			form1.name.focus()
			return false
		}

	if (form1.email.value == "")
		{
			alert("Please enter your email address")
			form1.email.focus()
			return false
		}
		
	if (isEmail(form1.email.value)==false)
    	{
    		alert("Please enter a valid email address ")
    		form1.email.focus();
    		return false;
    	}
				
	if (form1.phone.value == "")
		{
			alert("Please enter your contact phone")
			form1.phone.focus()
			return false
		}

}

function isEmail(str)
    {
  		// are regular expressions supported?
 	    var supported = 0;
 		if (window.RegExp)
   		{
    		var tempStr = "a";
    		var tempReg = new RegExp(tempStr);
   			if (tempReg.test(tempStr)) supported = 1;
  		}
  		
  		if (!supported) 
    		return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  		
		var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
		var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
		return (!r1.test(str) && r2.test(str));
}