function frm_headersearch_onsubmit()
{
	var txt = document.frm_headersearch.txt_keyword.value;
	var mint_txt=document.frm_headersearch.txt_keyword.value.length; 
	var mstr_txt=txt;
	var mint_count=0;
	
	//checking with each character for space
	for(var iloop=0;iloop<mint_txt;iloop++)
	{
		if(mstr_txt.charAt(iloop)==" ")
		{
			mint_count=mint_count+1;
		}
	}
	
	//if nothing entered in the field
	if (txt=="")
	{
		alert("Please enter the search keyword");
		document.frm_headersearch.txt_keyword.focus();
		return false;
	}
	
	if (mint_txt < 2)
	{
		alert("Please enter atleast 2 characters");
		document.frm_headersearch.txt_keyword.focus();
		return false;
	}
	
	//if only spaces are entered
	else if (mint_count==mint_txt)
	{
		alert("Please enter the search keyword");
		document.frm_headersearch.txt_keyword.focus();
		return false;
	}
}