function validate(){
	var email=document.contactus.email;
	var name=document.contactus.name;
	var company=document.contactus.company;
	var telephone=document.contactus.telephone;
	var message=document.contactus.message;
	if(email.value==""){
		alert("Please enter your email id");
		email.select();
		return false;
	}else if(!emailValidation(email.value)){
		alert("Please enter a valid email id");
		email.select();
		return false;
	}else if(name.value==""){
		alert("Please enter your name");
		name.select();
		return false;
	}else if(company.value==""){
		alert("Please enter company name");
		company.select();
		return false;
	}else if(telephone.value==""){
		alert("Please enter your telephone no.");
		telephone.select();
		return false;
	}else if(!numericValidation(telephone.value)){
		alert("Please enter a valid telephone no.");
		telephone.select();
		return false;
	}else{
		document.contactus.submit();	 
		return true;
	}
}

function emailValidation(email){
	var regexp=/^[a-zA-Z][A-Za-z0-9|_]*((\.)[a-zA-Z0-9|_]+)*@([0-9]*[a-zA-Z][0-9]*)+((\.)([0-9]*[a-zA-Z][0-9]*)+)+$/;
	if(email.search(regexp)==-1){
		return false;
	}else{ 
		return true;
	}
}

function numericValidation(numToCheck){
	var strValidChar="[0-9]";
	var strChar;
	for(i=0;i<numToCheck.length;i++){
		if((numToCheck.charAt(i)).search(strValidChar)==-1){
			return false;
		}
	}
	return true;
}

function clearText(){
	document.contactus.message.value="";
}