Make Search Though Validation Controls?

I've a search in website. If i search for a particular world it works fine in all pages but not in contact us. contact us page contains validation controls. I tried with removing validation controls, then the search works fine. how to make search though validation controls, are present.

function KeyPress(txt)
{
//alert(txt);
if(txt == "Search")
{
document.getElementById("ctl00_txtSearch").value = "";
}
}
function OnBlur(txt)
{
if(txt == "")
{
document.getElementById("ctl00_txtSearch").value = "Search";
// txtSearch.style.color = "silver";
}
}
function button_onclick()
{
if(document.getElementById("").value == "" || document.getElementById("").value == "Search ")
{
document.getElementById("").focus();
alert("Please Enter Text");
return false;
}
}