function valid()
	{
		f= document.contactus;
		if(Trim(f.com_name.value) =="")
		{
			alert("Please enter Comany Name");
			f.com_name.focus();
			return false;
		}
		if(Trim(f.name.value) =="")
		{
			alert("Please enter Name");
			f.name.focus();
			return false;
		}
		if(Trim(f.email.value)==""){
			alert("Please enter E-mail Address");
			f.email.focus();
			return false;
		}
		if(isEmail(f.email.value)=="")
		{
			alert("Please Enter a Valid E-mail Address");
			f.email.focus();
			return false;
		}
			
		return true;
	}
	function isEmail ( string ) 
{
	if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
		return true;
	else
		return false;
}

function Trim(str)
{   
		  while(str.charAt(0) == (" ") )
		   {  
			str = str.substring(1);
		   }
			 while(str.charAt(str.length-1) == " " )
			   {  
				  str = str.substring(0,str.length-1);
			   }
			  return str;
}