function loadimghao() //class="imgload-200-180" 传入宽高
{ 
    var widthtemp=100; //函数内部临时变量,初始值
	var loadwidthtemp=100; // 传入宽,初始值
	var loadheighttemp=100; // 传入高,初始值
	var imghaohaibotemp	= new Array; //定义数组；
	obj=document.getElementsByTagName("img"); 
	for(i=0;i<obj.length;i++) 
	{ 
		if(obj[i].className.substring(0,7)=="imgload") 
		{ 
		      imghaohaibotemp=obj[i].className.split("-");	
			  if (imghaohaibotemp.length==3)
			  {
		  	        loadwidthtemp=imghaohaibotemp[1];
					loadheighttemp=imghaohaibotemp[2];
					if(obj[i].height>loadheighttemp)
					   {
						   widthtemp=obj[i].width*loadheighttemp/obj[i].height;	
						   if (widthtemp>loadwidthtemp)
						   {
							  obj[i].height=obj[i].height*loadwidthtemp/obj[i].width;
							  obj[i].width=loadwidthtemp;							  
						   }
						   else
						   {
							  obj[i].width=widthtemp;
							  obj[i].height=loadheighttemp;
						   }
					   }
			  }
			   
		} 			
	} 
} 
window.onload = loadimghao;