function AssignKey() {
	var i,k;
	for (i=0;i<document.forms.length;i++) {
		for (k=0;k<document.forms[i].elements.length;k++) {
				if(document.forms[i].elements[k].type == "text" || document.forms[i].elements[k].type == "password" || document.forms[i].elements[k].type == "select-one" || document.forms[i].elements[k].type == "checkbox"){
					eval("document." + document.forms[i].name + "." + document.forms[i].elements[k].name + ".onkeypress=Check")
				}
		}
	}
}

function Check(keypressed) {
	var key,i;
	var sFormName,iTextBox;
	iTextBox=0;
	if (document.all) {
		key=window.event.keyCode;
	} 
	else {
		key=keypressed.which;
	}
	if (key==13) {	
		sFormName=eval("document." + this.form.name);
		for (i=0;i<sFormName.elements.length;i++){
				if (sFormName.elements[i].type == "text" || sFormName.elements[i].type == "password")
					iTextBox++;
		}
		if (iTextBox == 1) return;
		if(sFormName.onsubmit()){	
			//sForm.submit()
		}
		else{
			return false; 
		}
	}
}
AssignKey()